by M. Ali Hasan $5.00
by Dr. Sirajuddin Zar $6.00
by Drs. H. M. Yusran Asmuni $6.00
by David Betham $7.00
by - $36.00
by Sidarta Gautama $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Drs. G. Kartasapoetra $9.00
by Ir. FX. Susanto $7.00
by - $6.00